package com.ruoyi.gateway.service.impl;

import java.awt.*;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;

import com.ruoyi.common.core.utils.sign.Base64;
import com.wf.captcha.ArithmeticCaptcha;
import com.wf.captcha.ChineseCaptcha;
import com.wf.captcha.SpecCaptcha;
import com.wf.captcha.base.Captcha;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.ruoyi.common.core.constant.CacheConstants;
import com.ruoyi.common.core.constant.Constants;
import com.ruoyi.common.core.exception.CaptchaException;
import com.ruoyi.common.core.utils.StringUtils;
import com.ruoyi.common.core.utils.uuid.IdUtils;
import com.ruoyi.common.core.web.domain.AjaxResult;
import com.ruoyi.common.redis.service.RedisService;
import com.ruoyi.gateway.config.properties.CaptchaProperties;
import com.ruoyi.gateway.service.ValidateCodeService;
import org.springframework.util.FastByteArrayOutputStream;

/**
 * 验证码实现处理
 *
 * @author ruoyi
 */
@Service
public class ValidateCodeServiceImpl implements ValidateCodeService
{

    @Autowired
    private RedisService redisService;

    @Autowired
    private CaptchaProperties captchaProperties;

    /**
     * 生成验证码
     */
    @Override
    public AjaxResult createCaptcha() throws CaptchaException, IOException, FontFormatException {
        AjaxResult ajax = AjaxResult.success();
        boolean captchaEnabled = captchaProperties.getEnabled();
        ajax.put("captchaEnabled", captchaEnabled);
        if (!captchaEnabled)
        {
            return ajax;
        }
        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;
        // 三个参数分别为宽、高、位数
        SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 5);
        // 设置内置字体
        if(captchaProperties.getFont() >=0 && captchaProperties.getFont() < 10){
            specCaptcha.setFont(captchaProperties.getFont());
        }

        // 设置类型，字母数字混合
        specCaptcha.setCharType(Captcha.TYPE_DEFAULT);

        String base64 = specCaptcha.toBase64("");
        String code = specCaptcha.text();

        redisService.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        ajax.put("uuid", uuid);
        ajax.put("img", base64);
        return ajax;
    }

    /**
     * 校验验证码
     */
    @Override
    public void checkCaptcha(String code, String uuid) throws CaptchaException
    {
        if (StringUtils.isEmpty(code))
        {
            throw new CaptchaException("验证码不能为空");
        }
        if (StringUtils.isEmpty(uuid))
        {
            throw new CaptchaException("验证码已失效");
        }
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;
        String captcha = redisService.getCacheObject(verifyKey);
        redisService.deleteObject(verifyKey);

        if (!code.equalsIgnoreCase(captcha))
        {
            throw new CaptchaException("验证码错误");
        }
    }
}
